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https://issues.apache.org/jira/browse/PIG-856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12721574#action_12721574
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Milind Bhandarkar commented on PIG-856:
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+1 on seeing performance differences. But, is there code in pig to determine
that the output of a previous map-reduce stage is not accessible because of
datanode failures (as opposed to some other reason), and repeat the map-reduce
stage ? Because a single datanode failure with replication 1 will cause
temporary data to be unavailable, and is very likely for long-running queries.
> PERFORMANCE: reduce number of replicas
> --------------------------------------
>
> Key: PIG-856
> URL: https://issues.apache.org/jira/browse/PIG-856
> Project: Pig
> Issue Type: Improvement
> Affects Versions: 0.3.0
> Reporter: Olga Natkovich
>
> Currently Pig uses the default number of replicas between MR jobs. Currently,
> the number is 3. Given the temp nature of the data, we should never need more
> than 2 and should explicitely set it to improve performance and to be nicer
> to the name node.
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